Mattress



FIG. 1 is a perspective view of a mattress, showing my design.

FIG. 2 is a front elevation view of the mattress of FIG. 1, a rearelevation view of the mattress of FIG. 1 being symmetrical to the frontside elevation view of the mattress of FIG. 1.

FIG. 3 is a left side elevation view of the mattress of FIG. 1, a rightside elevation of the mattress of FIG. 1 being symmetrical to the leftside elevation view of the mattress of FIG. 1.

FIG. 4 is a top plan view of the mattress of FIG. 1, a bottom plan viewof the mattress of FIG. 1 being symmetrical to the top plan view of themattress of FIG. 1; and,

FIG. 5 is an enlarged view of an area labeled 5 in FIG. 1.

The broken lines in the drawings depict environmental structure andboundaries and form no part of the claimed design.

CLAIM The ornamental design for a mattress, as shown and described.